Wiki & Encyclopedia: After Rebirth, I Gained An Extra Sister

A man in his thirties who, after being struck by a truck, experiences a phenomena of rebirth, finding himself back in his high school classroom during his third year.

A middle-aged female homeroom teacher and Chinese language instructor at A County High School. She is known for having a generally gentle temperament, though she is currently frustrated with Gu Ran's academic decline.

A young English teacher at Gu Ran's high school. She is indifferent towards Gu Ran, viewing him as a defiant student from a privileged background whose academic performance is of no consequence.

Gu Ran's childhood friend and classmate. Currently a chubby, impulsive teenager known for his habit of chain-smoking. In the future, he evolves beyond his 'simp' phase to become more successful.

Gu Ran's father, a middle-aged professional who often wears silver-rimmed glasses and formal attire. He struggles to communicate with his son, frequently using a detached, authoritative tone typical of a superior in the workplace, yet he silently harbors deep concern and a desire to reconcile their strained relationship.

The top-performing student in the grade, noted for her aloof, elegant demeanor and striking appearance. She is currently focused on her studies while navigating social complexities.

Ye Zhenzhen's deskmate in the Science Fast Class, known for her lively and somewhat gossipy personality.

Ye Zhenzhen's mother. She is a warm individual seeking stability and a fresh start, currently in a developing relationship with Gu Xiangcheng.

Gu Xiangcheng's partner whom he intends to marry. She is a mother of a daughter roughly the same age as Gu Ran, and she views education highly, hoping her daughter and her future stepson will get along.

Gu Ran's father. An authoritative figure, likely a government official or executive (referred to as Director Gu), who is orchestrating a meeting between his son and his future wife.

Gu Xiaocheng's partner and the future stepmother of Gu Ran. She is elegant, charming, and gentle.

A top student at school, often considered cold or aloof. She is the daughter of Ye Shulian and unexpectedly linked to Gu Ran through their parents' relationships.

Gu Ran's father, who is waiting to pick the students up.

The father of Gu Ran. He is portrayed as a mature character who feels somewhat annoyed by his son's behavior and lack of appreciation for others' cooking skills, though he occasionally admits to his son's perspective.

A young girl who shares a close, somewhat complicated dynamic with Gu Ran. She is reserved yet sensitive, often becoming embarrassed or flustered by Gu Ran's actions.

A middle-aged teacher with a receding hairline who teaches in the fast-track class. He maintains a neutral stance toward Gu Ran, choosing neither to discipline nor favor him.

A 'cool beauty' type student, often seen with an aloof or icy demeanor. She is physically less fit than the male lead and is often teased by him.

Gu Ran's father, who recently left with his new wife to perform ancestral worship, leaving Gu Ran to his own devices.

A diligent person seen reviewing code and studying at a computer; she finds the game code provided by Gu Ran perplexing.